# All files / middleware tenant.js

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     /**
     * Tenant Middleware
     * Multi-tenant context extraction and validation
     *
     * @module middleware/tenant
     */

    const jwt = require('jsonwebtoken');
    const { pool } = require('../config/database');
    const { logger } = require('../config/logger');
    const GracePeriodService = require('../services/GracePeriodService');

    /**
     * Extract tenant context from request
     * Supports multiple methods: JWT token, header
     */
    async function tenantMiddleware(req, res, next) {
      try {
        let tenantId = null;
        let tenantInfo = null;

        // Method 1: Extract from JWT token (most common for API requests)
        const authHeader = req.headers.authorization;
        if (authHeader && authHeader.startsWith('Bearer ')) {
          const token = authHeader.split(' ')[1];
          try {
            const decoded = jwt.verify(token, process.env.JWT_SECRET);
            tenantId = decoded.tenantId;
            req.user = decoded;
          } catch (error) {
            // Token invalid, will be handled by auth middleware
          }
        }

        // Method 2: Extract from X-Tenant-ID header
        if (!tenantId && req.headers['x-tenant-id']) {
          tenantId = parseInt(req.headers['x-tenant-id']);
        }

        // If tenant ID found, validate and attach to request
        if (tenantId) {
          if (!tenantInfo) {
            const [tenants] = await pool.execute(
              'SELECT id, name, subdomain, status, max_users, max_conversations, max_messages_per_month, subscription_end_date, grace_period_end FROM tenants WHERE id = ?',
              [tenantId]
            );

            if (tenants.length > 0) {
              tenantInfo = tenants[0];
            }
          }

          // Check tenant status with grace period support
          if (tenantInfo) {
            // Check if tenant should have access (includes grace period check)
            const hasAccess = await GracePeriodService.shouldAllowAccess(tenantInfo);

            if (!hasAccess) {
              return res.status(403).json({
                success: false,
                error: 'Tenant account is suspended or cancelled',
              });
            }

            req.tenantId = tenantId;
            // Return display-friendly tenant info (hides grace_period details)
            req.tenant = GracePeriodService.getDisplayStatus(tenantInfo);
            logger.debug(`Tenant context set: ${tenantId} (${tenantInfo.name})`);
          }
        }

        next();
      } catch (error) {
        logger.error('Error in tenant middleware', { error: error.message });
        next(error);
      }
    }

    /**
     * Require tenant context
     * Ensures tenant ID is present in request
     */
    function requireTenant(req, res, next) {
      if (!req.tenantId) {
        return res.status(400).json({
          success: false,
          error: 'Tenant context is required',
        });
      }
      next();
    }

    /**
     * Check tenant limits
     * Validates if tenant has not exceeded their plan limits
     */
    async function checkTenantLimits(limitType) {
      return async (req, res, next) => {
        try {
          if (!req.tenantId) {
            return next();
          }

          const [tenants] = await pool.execute(
            'SELECT * FROM tenants WHERE id = ?',
            [req.tenantId]
          );

          if (tenants.length === 0) {
            return res.status(404).json({
              success: false,
              error: 'Tenant not found',
            });
          }

          const tenant = tenants[0];

          // Check specific limit
          switch (limitType) {
            case 'users':
              const [userCount] = await pool.execute(
                'SELECT COUNT(*) as count FROM users WHERE tenant_id = ?',
                [req.tenantId]
              );
              if (userCount[0].count >= tenant.max_users) {
                return res.status(403).json({
                  success: false,
                  error: 'User limit reached for your plan',
                });
              }
              break;

            case 'conversations':
              const [convCount] = await pool.execute(
                'SELECT COUNT(*) as count FROM conversations WHERE tenant_id = ?',
                [req.tenantId]
              );
              if (convCount[0].count >= tenant.max_conversations) {
                return res.status(403).json({
                  success: false,
                  error: 'Conversation limit reached for your plan',
                });
              }
              break;

            case 'messages':
              if (tenant.current_messages_count >= tenant.max_messages_per_month) {
                return res.status(403).json({
                  success: false,
                  error: 'Monthly message limit reached for your plan',
                });
              }
              break;
          }

          next();
        } catch (error) {
          logger.error('Error checking tenant limits', { error: error.message });
          next(error);
        }
      };
    }

    module.exports = {
      tenantMiddleware,
      requireTenant,
      checkTenantLimits,
    };